body {
    --bubble_time: 3s;
    --bubble_scale: 0.8s;
}
.content_bubble {
    width: 100px;
    height: 200px;
    position: relative;
    background-color: #f4f4f4;
}
.bubble {
    position: absolute;
    width: 40px;
    height: 40px;
    left: 30px;
    bottom: 0px;
    background-repeat: no-repeat;
    background-size: 100%;
    transform-origin: bottom;
}
.b1 {
    background-image: url(../assets/img/bg1.png);
}
.b2 {
    background-image: url(../assets/img/bg2.png);
}
.b3 {
    background-image: url(../assets/img/bg3.png);
}
.b4 {
    background-image: url(../assets/img/bg4.png);
}
.b5 {
    background-image: url(../assets/img/bg5.png);
}
.b6 {
    background-image: url(../assets/img/bg6.png);
}

.bl1 {
    animation: bubble_1 var(--bubble_time) linear 1 forwards, bubble_big_1 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl2 {
    animation: bubble_2 var(--bubble_time) linear 1 forwards, bubble_big_2 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl3 {
    animation: bubble_3 var(--bubble_time) linear 1 forwards, bubble_big_1 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl4 {
    animation: bubble_4 var(--bubble_time) linear 1 forwards, bubble_big_2 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl5 {
    animation: bubble_5 var(--bubble_time) linear 1 forwards, bubble_big_1 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl6 {
    animation: bubble_6 var(--bubble_time) linear 1 forwards, bubble_big_3 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl7 {
    animation: bubble_7 var(--bubble_time) linear 1 forwards, bubble_big_1 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl8 {
    animation: bubble_8 var(--bubble_time) linear 1 forwards, bubble_big_3 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl9 {
    animation: bubble_9 var(--bubble_time) linear 1 forwards, bubble_big_2 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl10 {
    animation: bubble_10 var(--bubble_time) linear 1 forwards, bubble_big_1 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
.bl11 {
    animation: bubble_11 var(--bubble_time) linear 1 forwards, bubble_big_2 var(--bubble_scale) linear 1 forwards,
        bubble_y var(--bubble_time) linear 1 forwards;
}
@keyframes bubble_11 {
    0% {
    }
    25% {
        margin-left: -10px;
    }
    50% {
        margin-left: -10px;
    }
    100% {
        margin-left: -18px;
    }
}
@keyframes bubble_10 {
    0% {
    }
    25% {
        margin-left: -20px;
    }
    50% {
        margin-left: -20px;
    }
    100% {
        margin-left: -20px;
    }
}
@keyframes bubble_9 {
    0% {
    }
    25% {
        margin-left: 10px;
    }
    50% {
        margin-left: 10px;
    }
    100% {
        margin-left: 10px;
    }
}
@keyframes bubble_8 {
    0% {
    }
    25% {
        margin-left: 20px;
    }
    50% {
        margin-left: 20px;
    }
    100% {
        margin-left: 20px;
    }
}
@keyframes bubble_7 {
    0% {
    }
    25% {
        margin-left: 3px;
    }
    50% {
        margin-left: 1px;
    }
    75% {
        margin-left: 2px;
    }
    100% {
        margin-left: 3px;
    }
}
@keyframes bubble_6 {
    0% {
    }
    25% {
        margin-left: -3px;
    }
    50% {
        margin-left: -1px;
    }
    75% {
        margin-left: -2px;
    }
    100% {
        margin-left: -3px;
    }
}
@keyframes bubble_5 {
    0% {
    }
    25% {
        margin-left: 5px;
    }
    50% {
        margin-left: -5px;
    }
    75% {
        margin-left: -10px;
    }
    100% {
        margin-left: -20px;
    }
}
@keyframes bubble_4 {
    0% {
    }
    25% {
        margin-left: -5px;
    }
    50% {
        margin-left: -5px;
    }
    75% {
        margin-left: 20px;
    }
    100% {
        margin-left: 10px;
    }
}
@keyframes bubble_3 {
    0% {
    }
    25% {
        margin-left: -20px;
    }
    50% {
        margin-left: 10px;
    }
    75% {
        margin-left: 20px;
    }
    100% {
        margin-left: -10px;
    }
}
@keyframes bubble_2 {
    0% {
    }
    25% {
        margin-left: 20px;
    }
    50% {
        margin-left: 25px;
    }
    75% {
        margin-left: 10px;
    }
    100% {
        margin-left: 5px;
    }
}
@keyframes bubble_1 {
    0% {
    }
    25% {
        margin-left: -8px;
    }
    50% {
        margin-left: 8px;
    }
    75% {
        margin-left: -15px;
    }
    100% {
        margin-left: 15px;
    }
}
@keyframes bubble_big_1 {
    0% {
        transform: scale(0.3);
    }
    100% {
        transform: scale(1.2);
    }
}
@keyframes bubble_big_2 {
    0% {
        transform: scale(0.3);
    }
    100% {
        transform: scale(0.9);
    }
}
@keyframes bubble_big_3 {
    0% {
        transform: scale(0.3);
    }
    100% {
        transform: scale(0.6);
    }
}
@keyframes bubble_y {
    0% {
        margin-bottom: 0;
    }
    10% {
        margin-bottom: 0;
    }
    75% {
        opacity: 1;
    }
    100% {
        margin-bottom: 200px;
        opacity: 0;
    }
}
